Can you upgrade humble bundle?

Related questions

1. Can I get a refund on Humble Bundle?
2. What is humble book bundle?
3. How much of Humble Bundle goes to charity?
4. Does humble monthly auto renew?
5. Is there a Humble Bundle for ps4?
6. How do I cancel my humble bundle subscription?
7. How does the Humble Bundle monthly work?
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10. Can you get a refund on Humble Bundle?

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